如何检查整数 Swift 中的布尔值

Question

我是 Swift 的新手，我正在尝试为 Mac OS X 制作一个登录程序。我确实知道 iOS 上的 Swift 编程，但我对 OS X Swift 了解不多。所以我为OS X写了一个程序。我几乎完成了它，但我想通过整数检查我的布尔详细信息，例如，如果学生的分数等于我的变量，我想做的，它显示了你得到的成绩。

class ViewController: NSViewController {
@IBOutlet var Maths: NSTextField! = NSTextField()
@IBOutlet var Science: NSTextField! = NSTextField()
@IBOutlet var English: NSTextField! = NSTextField()
@IBOutlet var Religious: NSTextField! = NSTextField()
@IBOutlet var History: NSTextField! = NSTextField()
@IBOutlet var Geography: NSTextField! = NSTextField()
@IBOutlet var ICT: NSTextField! = NSTextField()
@IBOutlet var Computing: NSTextField! = NSTextField()
@IBOutlet var Total: NSTextField!
@IBOutlet var AVG: NSTextField!
@IBOutlet var StudentName: NSTextField!
@IBOutlet var StudentClass: NSTextField!
@IBOutlet var Report: NSTextField!

var A = 80 > 100
var B = 75 > 80
var C = 60 > 75
var D = 50 > 60
var E = 40 > 50
var F = 0 > 40


override func viewDidLoad() {
    super.viewDidLoad()

}
override var representedObject: AnyObject? {
    didSet {
    // Update the view, if already loaded.

    }
}
@IBAction func CountTotalnAVG(sender: NSButton) {
    var Mathsc = Maths.stringValue.toInt()
    var Sciencec = Science.stringValue.toInt()
    var Englishc = English.stringValue.toInt()
    var Religiousc = Religious.stringValue.toInt()
    var Historyc = History.stringValue.toInt()
    var Geographyc = Geography.stringValue.toInt()
    var ICTc = ICT.stringValue.toInt()
    var computingc = Computing.stringValue.toInt()
    /*
    var add = (Mathsc?.advancedBy(Sciencec!).advancedBy(Englishc!).advancedBy(Religiousc!).advancedBy(Historyc!).advancedBy(Geographyc!).advancedBy(ICTc!).advancedBy(computingc!))
    */
    var add: Int = (Mathsc! + Sciencec! + Englishc! + Religiousc! + Historyc! + Geographyc! + ICTc! + computingc!)
    Total.stringValue = "(add)"
    var divide:Int = add/8
    AVG.stringValue = "(divide)"
}
@IBAction func GetReport(sender: NSButton) {
    var A = 80 > 100
    var B = 75 > 80
    var C = 60 > 75
    var D = 50 > 60
    var E = 40 > 50
    var F = 0 > 40
    var Mathsc = Maths.stringValue.toInt()
    var Sciencec = Science.stringValue.toInt()
    var Englishc = English.stringValue.toInt()
    var Religiousc = Religious.stringValue.toInt()
    var Historyc = History.stringValue.toInt()
    var Geographyc = Geography.stringValue.toInt()
    var ICTc = ICT.stringValue.toInt()
    var computingc = Computing.stringValue.toInt()
    if Mathsc = A.boolValue {
    }
}    
}

Answer 1

您可以使用switch检查值是否在区间内：

func getGrade(score: Int) -> String {
    let result: String
    switch score {
    case 80...100 :
        result = "A"
    case 75..<80 :
        result = "B"
    case 60..<75 :
        result = "C"
    case 50..<60 :
        result = "D"
    case 40..<50 :
        result = "E"
    case 0..<40 :
        result = "F"
    default:
        result = "F"
    }
    return result
}
let mathsStr = "42"
let mathsNum = mathsStr.toInt()
println(getGrade(mathsNum!)) // prints "E"